The Stanley Intelli Tools Digital Infrared Thermometer is accurate to within 3° with a wavelength between 630-660nm and a temperature range of -38°C to +520°C. This large range allows users to effectively complete their desired tasks. With a high contrast, back lit display for visibility in all light conditions and an IP20 casing that provides protection against dust, increasing its working life. Features thermal leak detection, from a reference temperature (green screen). Scanning an area will show a red screen for high temperature and blue screen for low temperature. Its 8:1 spot ratio allows for users to measure a 32cm circle from 2.5m distance. Emissivity 0,95, covers all thermal radiation emission of most materials. Powered by 2 x AA batteries which are supplied.